Abstract: Aiming at the engineering problem of large displacement for I-beam supported complex coal roadways suffering from factors non-uniform stress, the non-uniform types are classified according to the contact situations between the I-beam support system and the whole surrounding rock. Combined with the numerical simulation and theoretical analysis methods, the stress and displacement characteristics of roof and side beams for two non-uniform types are studied, and the results showed the deformation and suffering stress without loading of one of the side beams were larger than the other partly loading type. Besides, the control countermeasures to the proper I-beam support were proposed for complex underground coal roadways.